Add requirements.txt and tips

.gitignore

@@ -6,3 +6,5 @@ __pycache__
 *.db
 htmlcov/
 .coverage
+venv
+env

README.md

@@ -8,11 +8,28 @@ Demo: http://watchlist.helloflask.com
 
 ## Installation
 
+clone:
 ```
 $ git clone https://github.com/greyli/watchlist.git
 $ cd watchlist
+```
+create & active virtual enviroment then install dependencies:
+
+option 1 (with Pipenv):
+```
 $ pipenv install --dev
 $ pipenv shell
+```
+
+option 2 (with venv/virtualenv + pip):
+```
+$ python -m venv env  # use `virtualenv env` for Python2, use `python3 ...` for Python3 on Linux & macOS
+$ source env/bin/activate  # use `env\Scripts\activate` on Windows
+$ pip install -r requirements.txt
+```
+
+generate fake data then run:
+```
 $ flask forge
 $ flask run
 * Running on http://127.0.0.1:5000/

requirements.txt

@@ -0,0 +1,12 @@
+click==7.0
+flask-login==0.4.1
+flask-sqlalchemy==2.3.2
+flask==1.0.2
+itsdangerous==1.1.0
+jinja2==2.10
+markupsafe==1.1.0
+python-dotenv==0.10.1
+sqlalchemy==1.2.16
+werkzeug==0.14.1
+# dev
+coverage==4.5.2